Lionel has used several K-Line scale steam tools in Legacy. VL Hudson is based on the K-Line Hudson tooling, Legacy Lima B&M Berkshire is K-Line as well. Lionel re-engineered the chassis on both to put a larger motor in the firebox. Lionel also uses K-Line tooling for their scale Mikados, Pacifics, and 4-6-6T, but kept the small forward facing motor on those.
The PRR K4 is another that comes to mind too,….albeit it can be tossed into the Pacific category,…😉